Physics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2387y&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, Sept. 1989, p. 2387-2394. Research supported by the University of Tsu
Physics
18
Crystal Lattices, Gaseous Diffusion, Mass Spectroscopy, Oxygen Isotopes, Single Crystals, Carbonaceous Chondrites, Diffusion Coefficient, Planetary Nebulae, Solar System, Solid Solutions
Scientific paper
Oxygen-diffusion coefficients in melilite lattices were estimated by analyzing the structure of O-18 profiles determined in single crystals of gehlenite using SIMS. The lattice diffusion O-coefficients were found to be 2 to 4 orders of magnitude lower than those previously reported by Hayashi and Muehlenbachs (1986) for melilite solid solutions. The reason for these high diffusion rates in melilite solid solutions and the heterogeneous distribution of oxygen isotopes in the Allende Ca, Al-rich inclusions (CAIs) was investigated considering the contribution of fast diffusion along dislocations and possible changes in diffusion rate with gehlenite-akermanite ratios in melilite; the oxygen diffusion coefficients along dislocations were calculated by analyzing 'tailing' of the O-diffusion profiles. The results suggest that it is unlikely that the O-isotope differences in the Allende CAI minerals are the result of diffusion processes during a postcrystallization thermal event.
Morioka Masana
Nagasawa Hiroshi
Yurimoto Hisayoshi
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